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The routine CPXsetdblparam sets the value of a CPLEX
 parameter of type double.
The reference manual ILOG CPLEX Parameters provides a list of parameters with their types, options, and default values.
Example
status = CPXsetdblparam (env, CPX_PARAM_TILIM, 1000.0);
| env | A pointer to the CPLEX environment as returned by   | 
| whichparam | The symbolic constant (or reference number) of the parameter to change.  | 
| newvalue | The new value of the parameter.  |